Lathe grinding attachment.



I L. MATULA. .LATHE GRiNDlNG ATTACHMENT.

APPLICATION FILED AUG.B. I915.

1,229,496, Patented June 12, 1917. v

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L. MATULA.

LATHE GRINDING ATTACHMENT. APPLICATION FILED AUG.8, 19m.

1,29,496o Patented June 12, 191;

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L. MATULA. LATHE GRINDING ATTACHMENT.

APPLICATION FILED AUG-8.1916.

1,229,496 Patented June 12, 1917.

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LOUIS IVIA'IULA, OF'GLEVELAND, OI-IIO.

LATHE GRINDING ATTACHMENT.

Specification of Letters Patent.

Patented June 12, 1917.

Application filed August 8, 1916. Serial No. 113,741.

Zball whom 2'25 may concern:

Be it known that I, LOUIS MATULA, a subject of the King of Hungary, and a resident of Cleveland, in the county of Cuyahoga and State of Ohio, have: invented new and useful Improvements in Lathe Grinding Attachments, of which the following is a specification.

This invention relates to improvements in apparatus for grinding and truing small articles in a lathe and particularly in grinding the centers used with the lathe.

One of the objects of the invention is to provide an apparatus which may be easily and quickly applied in its operative position upon the ways or shears of a lathe, the device being entirely selfcontained, and adapted to be driven by frictional contact with the larger step of the cone pulley used in driving the lathe.

A further object is to provide such an apparatus by means of which an abrading wheel may be driven and manipulated, the frictional driving contact being attained through an adjustable lever system by which it may be controlled.

These and other objects, such as simplicity, durability of parts, and ease of operation, are attained by the novel construction and combination of parts hereafter described and shown in the accompanying drawings, forming a material part of this specification, and in which Figure l is a side elevational view of a conventional type of lathe or turning ma chine showing the general application of the invention.

Fig. 2 is an enlarged fragmental front view of the same.

Fig. 3 is a transverse sectional view, partially diagrammatic, of the same.

Fig. 1 is a longitudinal sectional view, showing an abrading wheel, its supporting and driving means.

Fig.5 is a front view of the friction driving disk and its supporting arm.

Fig. 6 is a fragmental side elevational view showing the grinding attachment engaged with the compound rest of a lathe.

Fig. 7 is a side view of the holder in which the grinding attachment is secured, and

F1 8 is a fragmental side elevation view, showm the abrading wheel engaged with the hol er.

The frequent use of some apparatus for truing l e ent rs is a r gn zed necessi y as they rapidly wear from a true conical shape and when such wear occurs, work can no longer be accurately produced when held by the centers if they rotate eccentrieally or if misshaped from a recognized standard.

The apparatus shown conslsts of a block 10, having a V shaped longitudinal recess 11 formed therein, and suited to the si1nilarly shaped ways or shears of the lathe bed at its front.

The block is shiftable longitudinally on the ways into such a position as may be desired and then held by the clamp plate 12, through the bolt 13, and adjusting screw 14- in an obvious manner.

Rigidly attached to the block 10 is a seg mental plate 16, secured to the end thereof, and having a plurality of serrations l7 disposed upon its upper, arcuate edge and contered on the plate is a lever 18 held by the pivot 19 and provided with a manually operated handle 20 at its extreme upper end.

Attached to the lever 18 is a pawl 22 having an operating link 23 actuable by a handle 2d, normally held outward by means of thespring 25 from the operating handle 20.

Upon the opposite side of the lever 18 is a bracket element 28 which may be secured by screws 29, to the height required, the bracket having an extending lug 30, in which, carried by the pivot 31, is a swinging bracket 32, the same being used as a mounting for the revoluble shaft 33, having at one end a friction disk 35, as of rubber, leather or fiber, adapted to impinge upon the peripheral driving surface of the cone pulley and held normally thereagainst by the spring 36, the tension of which is adjusted by movement of the lever 18, or which may be retracted when desired by movement of the lever.

The opposite end of the shaft 33 has secured to it a suitable length of flexible shaft 40, the game being engaged at its outer end to a spindle 4:1, revolubly mounted in a bearing 4L2, the same being knurled or corrugated upon its exterior 43 so as to be conveniently held in an operators hand. Provisions are made for receiving the sleeve 14: within the handle element, the sleeve being prevented from retracting by means of the spring-pressed pin 45, entering an annular groove 4L6 formed in the sleeve 44 as can best be seen in Fig. 4.

The front end of the handle has an enlar gi d head 48, of such diam ter as t we vent the hand from slipping and coming in contact with the Wheel, and is bored to receive an annular ball bearing 50, held in position by the ring 51 in an obvious manner, thus permitting the shaft to readily revolve and taking the thrust of the Wheel 52, secured between flanges 53 and 54: by the nut 55, on the screw threaded end 56 of the spindle 41. I s

As the compoundrest may be set at any angle with the shears it is obvious that the abrading wheel 52 may be caused to travel in any angular direction, or moved in a plane parallel to the shear by the carriage thus providing means for cylindrical grinding.

In operation, the block being secured upon the front ways and shears of the lathe in a proper location, the lever 18' is advanced to press the disk against the periphery of the cone pulley to such an eX- tent as to cause the shaft to rotate, the handle 43 being manipulated in an obvious manner, so as to bring the Wheel 52 into contact with the lathe center or with what ever article it is desired to grind.

If the abrading wheel be in the compound rest it is possible to raise or lower same, by the action of the tool post and to move the wheel toward the head or foot of the lathe by the carriage action.

Thus hardened lathe centers or other similar articles too hard to be turned by ordinary cutting tools, maybe quickly and easily ground While in the lathe and Without the necessity of employing a separate and expensive machine for the purpose.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent is y 1. In a grinder of the class described, the

combination with an annular rotary element and a fixed support, of a block adjustably slidable 011 said fixed support, means for clamping said block to said support, a

segmental bracket carried by said block having teeth ,upon its arcuate upper edge, a lever pivoted'to said bracket, a pawhand means for operation thereof, combined with said lever, a bracket adjustable longitudinally on said lever, a friction disk pivotally carried by said bracket, means for pressing said disk against; said rotary element, a

flexible shaft driven by said friction disk,

an abrading wheel operatively connected with said flexible shaft and means for 1115111, ually controllingsaid abrading wheel,

2. In a grinder, the combination with an annular rotatable element and a fixed sup- .port, of a block movable on said support,

Copies of this patent may be obtained for five cents each, by addressing the'Gommissioner of Patents,

' Washington, D. G. I 

